Re Entrant Corner Crack
What Causes Concrete to Crack?
Posted By:Dynamic Concrete Pumping , Date: May 22, 2019
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Re-Entrant Corner Cracks: Re-entrant corner cracks are a special kind of shrinkage that occurs when concrete is poured around a column with corners. They can also happen when the concrete is poured around a rounded object, like a manhole. When shrinkage takes place, the concrete cannot shrink evenly around the object. Placed at 45 degrees to the re-entrant corner with nominal top cover. The crack control measures are there to arrest the crack opening and not prevent crack formation. It is the job of isolation detailing and joint positioning to reduce the risk of crack formation at re-entrant corners. Errors in design and detailing that may result in unacceptable cracking include use of poorly detailed reentrant corners in walls, precast members and slabs, improper selection and/or detailing of reinforcement, restraint of members subjected to volume changes caused by variations in temperature and moisture, lack of adequate contraction joints, and improper design of foundations, resulting in differential movement within the structure. Mar 16, 2017 Diagonal cracks which emanate from the corners or windows, openings, or other changes in the shape of a wall (or slab) are called reentrant cracks and are a form of shrinkage crack. Temperature and shrinkage cracks in foundations may appear within days to several years after the home is occupied. Re-entrant reinforcement Weak points occur where the concrete slab forms an internal corner because of the overall shape of the building. This internal corner is referred to as a re-entrant corner. It must have additional reinforcement as cracks are likely to develop from this point.
Concrete is a miraculous substance. Extremely hard and durable, it is an ideal material for construction, whether you are building the foundation of an apartment building or an outdoor pool. One drawback of concrete is that it has a tendency to crack. But why does concrete crack — and what can you do about it?
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Reentrant Corner Crack
There are actually several common causes of concrete cracking. Here is a list of some of the basic types of concrete cracks, what causes concrete to crack in these ways, and what you can do about it.
Types of Concrete Cracks
Reentrant Corners In A Slab
- Shrinkage: The most common type of cracking in concrete, especially early on, is shrinkage. Concrete is a mix of cement and water. As the concrete hardens, which is caused by the cement and water forming bonds, some of that water escapes through evaporation. This reduces the size of the concrete slab, and since concrete is a very hard, tightly bound substance, this loss of material creates stress. This stress can lead to cracks in the concrete. Solutions to shrinkage cracks include reducing the amount of water in your concrete mix and cutting control joints in the slab so that if it does crack, it cracks along predetermined lines that do not significantly affect the integrity of the concrete.
- Re-Entrant Corner Cracks: Re-entrant corner cracks are a special kind of shrinkage that occurs when concrete is poured around a column with corners. They can also happen when the concrete is poured around a rounded object, like a manhole. When shrinkage takes place, the concrete cannot shrink evenly around the object. Instead, long cracks can result, radiating from said object. Properly cut control joints are the generally accepted method for warding off this issue.
- Expansion Cracks: In hot weather, bonds within the concrete can weaken and the concrete can expand, creating stress. If the concrete does not have room to expand, it will crack. You can prevent this by adding an expansion joint made of a compressible material, like tar-impregnated cellulose fiber, to allow some “give” in the concrete.
- Heaving Cracks: In very cold weather, the freeze and thaw cycle may cause the concrete to lift and heave, resulting in cracks. Avoid this by paving over soil that drains away moisture and will “give” with the slab, rather than tightly packed, unyielding soil, and by not pouring too close to large tree roots.
- Settlement Cracks: These usually occur if the concrete has been poured over ground that is not well-suited to hold it. Examples include soil where a nearby tree has just been removed and the roots are decomposing, or where a utility trench has been refilled but not properly compacted.
- Excessive Weight Cracks: Concrete, like anything else, has load limits, although they can be very high. If the weight you put on concrete exceeds this limit, expect cracks to form. This is rarely a problem in residential situations, but if you are working with very heavy equipment or other items, you may wish to verify that your concrete can bear it.
For more valuable tips on pouring concrete effectively, contact Dynamic Concrete Pumping today.
This paper examines cracks which occurred at the re-entrant corners at the dapped ends of bulb tee girders used on the MIA Mover APM System at Miami International Airport. Cracks were initially identified during load testing at the precast yard, although typically they did not occur until the beams were erected. The load test and crack mechanism is described herein. Post-erection cracking is compared with that observed under load test conditions and differences are discussed. FDOT criteria were applied in determining the appropriate protection strategy.
- Record URL:
- https://doi.org/10.1061/41193(424)14
- Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784411933
- Supplemental Notes:
- Copyright © 2011 ASCE
- Authors:
- Leverenz, David G.
- Davidson, Thomas E.
- Conference:
- Location: Paris , France
- Date: 2011-5-22 to 2011-5-25
- Publication Date: 2011
Language
- English
Media Info
Reentrant Corner Bars
- Media Type: Web
- Monograph Title: Proceedings of the Thirteenth International Conference on Automated People Movers and Transit Systems, 2011
Subject/Index Terms
- TRT Terms: Load tests; People movers; Precast concrete
- Identifier Terms: Miami International Airport
- Uncontrolled Terms: Bulbtee girders
- Geographic Terms: Florida
- Subject Areas: Maintenance and Preservation;
Filing Info
Reentrant Corner Check
- Accession Number: 01365047
- Record Type: Publication
- ISBN: 9780784411933
- Files: TRIS, ASCE
- Created Date: Nov 29 2011 3:00PM